1 /*
2 * arch/sh/kernel/topology.c
3 *
4 * Copyright (C) 2007 Paul Mundt
5 *
6 * This file is subject to the terms and conditions of the GNU General Public
7 * License. See the file "COPYING" in the main directory of this archive
8 * for more details.
9 */
10 #include <linux/cpu.h>
11 #include <linux/cpumask.h>
12 #include <linux/init.h>
13 #include <linux/percpu.h>
14 #include <linux/node.h>
15 #include <linux/nodemask.h>
16
17 static DEFINE_PER_CPU(struct cpu, cpu_devices);
18
19 cpumask_t cpu_core_map[NR_CPUS];
20 EXPORT_SYMBOL(cpu_core_map);
21
cpu_coregroup_map(unsigned int cpu)22 static cpumask_t cpu_coregroup_map(unsigned int cpu)
23 {
24 /*
25 * Presently all SH-X3 SMP cores are multi-cores, so just keep it
26 * simple until we have a method for determining topology..
27 */
28 return cpu_possible_map;
29 }
30
cpu_coregroup_mask(unsigned int cpu)31 const struct cpumask *cpu_coregroup_mask(unsigned int cpu)
32 {
33 return &cpu_core_map[cpu];
34 }
35
arch_update_cpu_topology(void)36 int arch_update_cpu_topology(void)
37 {
38 unsigned int cpu;
39
40 for_each_possible_cpu(cpu)
41 cpu_core_map[cpu] = cpu_coregroup_map(cpu);
42
43 return 0;
44 }
45
topology_init(void)46 static int __init topology_init(void)
47 {
48 int i, ret;
49
50 #ifdef CONFIG_NEED_MULTIPLE_NODES
51 for_each_online_node(i)
52 register_one_node(i);
53 #endif
54
55 for_each_present_cpu(i) {
56 struct cpu *c = &per_cpu(cpu_devices, i);
57
58 c->hotpluggable = 1;
59
60 ret = register_cpu(c, i);
61 if (unlikely(ret))
62 printk(KERN_WARNING "%s: register_cpu %d failed (%d)\n",
63 __func__, i, ret);
64 }
65
66 #if defined(CONFIG_NUMA) && !defined(CONFIG_SMP)
67 /*
68 * In the UP case, make sure the CPU association is still
69 * registered under each node. Without this, sysfs fails
70 * to make the connection between nodes other than node0
71 * and cpu0.
72 */
73 for_each_online_node(i)
74 if (i != numa_node_id())
75 register_cpu_under_node(raw_smp_processor_id(), i);
76 #endif
77
78 return 0;
79 }
80 subsys_initcall(topology_init);
81